Heat transfer unit



Feb. 12, 1935.

L. w. CHILD HEAT TRANSFER UNIT Filed Aug. 7, 1955 2 Sheets-Sheet l uillnlivhllrf l-en. 12, 1935. L. w. CH| LD 7 1,991,194 Q I-iEAT TRANSFER UNIT Filed Aug.- '7, 1953- 2 Sheets-Sheet 2 by the motor and fan may Patented Feb. 12, 1935 UNITED STATES 1,991,194 niza'r TRANSFER Um'r Lachlan w. Child, Toledo, Appliance Way Electric Ohio, assignor to Air- Corporation, Toledo,

Ohio, a corporation of Delaware Application August 7, 1933, Serial No. 684,000

.16 Claims.

This invention'relates to heat transfer air conditioners of the type embodying an annular radiator, composed of arched vaned tubes and has for its object to'provide an improved arrangement of extreme simplicity, in which the radiator is formed in two semi-circular sections, joined to a rigid mounting comprising simply a diametrical member to the upper and lower ends of which the radiator tubes areconnected, and from the intermediate region of which a fan motor is supported.

This application is a continuation in part of application Serial 1932.

Another object is vice including concentric, inner and outer fans, one to move an annular column of air through the radiator, and the other to move a column of unconditioned air within said annular column, and means for keeping thetwo columns separated as they pass through the heater.

The present invention provides for separation of the air stream'in the fan itself, an annular fiat ring being provided, serving not only to separate the two fans, but also to rigidity the fan structure, provide a supporting base for the mountmg of the outer fan blades, and affording a means Another object is to provide an improved mounting for the radiator and the Ian motor, embodying upper and lower headers and a bracket connecting the headers, the bracket being c shaped'so as to allow the motor to be positioned close to the central plane of the radiator, wherebe balanced with respect to said central plane.

Another object is to construct the aforesaid bracket so as to suspend the motor with none of the weight of the motor imposed upon the central web of the-bracket, whereby the latter may be made relatively light.

Another object isto provide improvedmeans for connecting the two halves of the radiator to the headers, the in vidual tubes of a respective half being integrally united at their ends to term a unitary section, attachable to and detachable from the headers,

with these and other objects in view my invention consists in the combination and construction and arrangement of the various parts therewhereby the objects contemplated are at tamed, as more fully set forth intlie accom-, panylng speclncati mpointed out in my claims,

Fig. 1 is a front N0. 585,314, filed January 7,,

to provide an air moving deand illustrated in the accompanying drawings, in which:

elevation of the heat exchanger. Fig. 2 is a vertical sectional view through the same. I

Fig. 3 is a view of the mounting bracket, and Fig. .4 is a detail sectional view taken on the line 4--4 of Fig. 1.

Fig. 5 is a view similar to Fig. 2 of a modified form of the invention.

Fig. 6 is a similar view 01' a further modification of the invention, and

Fig. 7 is an elevational view of the form shown in Fig. 6.

The mounting of the heat exchanger comprises the headers 10 and central bracket C, secured to gether end to end and located diametrically oi the exchanger.

'The bracket C is c shaped in side elevation, including the upper and lower arms 11 and 12 connected integrally by the central web 13, the latter being displaced laterally from the central peripheral plane of the radiator R so that the motor 14 may be accommodated in a position intersecting or close to, said central plane.

.9 The motor 14 is suspended from the arm 11, which is of very sturdy construction, and thus the load carried by the web 13 is relatively light, and the web is correspondingly of lighter construction than the arm 11 A shelf 15 is formed on the arm 11, iormounting the motor (Fig. 3). The motor shaft 22 extends through a ring 50 formed in the web 13. I

The headers 10 are provided with connections 51 into which are threaded'fluid carrying pipes 52. The connections 51 are disposed in the diametrical axis of the mounting comprising the headers and bracket C. Lateral connections 53 may also be provided for particular installations.

The radiator R is formed in two hall. sections, 4

each semi-circular, and each composed of a pinrality oi arched vaned tubes 16 of a known type. Instead of connecting the tubes singly to the headers, however, they are integrally united at their ends as follows:

The ends 01 the tubes 16 are cut down to eliminate the vanes, and thence extended through a cap plate 17. A gasket plate 18 preferably of the same material as the tubes 16 (usually aluminum) or of some material having suflicient ductility to serve as a gasket, is perforated to provide a series of openings bordered by punched out rims 19, 01' proper diameter to receive the tubes 18, and the ends of the tubes are welded to the rims 19 as indicated. Thus the tubes and gasket 55 plate form one integral structure, which is fluidigh The headers are open at their sides, and the cap plates 1'7 are secured over said open sides by cap screws 20, the gasket plates 18 serving as gaskets and the cap plates 17 rigidly supporting the gasket plates and the tubes against any loosening of the welded joints or of the contact seal with the headers.

The air mover F comprises an inner fan including a hub 21' mounted on the motor shaft 22, and blades 23 radiating from the hub 21; a separator ring 24 to which the outer ends of the blades 23 are aflixed; and an outer fan comprising blades 25 mounted upon the separator ring 24.

The ring 24 serves to prevent radial slippage of the air passing through the inner fan. It prevents the air stream from the outer fan taking the path of least resistance and flowing toward the free open space within the radiator R. It serves to brace and rigidity the inner fan structure, and provides a mounting for the outer blades, so that the number of outer blades may be independent of the number of inner blades.

The outer fan preferably comprises a greater number of blades, having a different inclination than that of the inner fan blades, in order to meet the greatest resistance offered by the radiator as compared with the space within the radiator.

The two fans are balanced so that the inner fan projects a column of air at the proper rate' of movement to negative any resistance between the inner and outer air columns.

The radiator R is surrounded by a cylindricalcasing or shroud 54 which projects also over the periphery of the fan F.

In Fig. I have shown a modification of the invention wherein the two fans 23a and 2511 are formed in a single sheet of material.

The means for separating the annular column of air from the inner column may comprise a ring 60 on the inside oi the radiator R. The ring 60 serves to prevent air from the outer fan being deflected into the central space within the radiator by the resistance that the radiator offers to the air flow.

Instead of employing an outer fan coextensive with the face of the radiator, I may employ smaller, higher speed tans, and extend the ring 60 and shroud 54a. in irusto-conical form to meet the peripheries of the respective fans, as shown in Figs. 6 and 7.

What I claim is:

1. In a heat exchanger, a ring shaped radiator, an outer tan positioned substantially parallel to the face of said radiator, to pass an annular column or air through said radiator, and an inner fan having blades of different inclination, positioned to propel a column of unheated air within said annular column. I

2. In a heat exchanger, a ring shaped radiator. an outer fan positioned substantially parallel to the face of said radiator, to pass an annular column of air through said radiator, and an inner fan having blades of diiierent inclination, positioned to propel a colunm of unheated air within said annular column, and a cylindrical ring separating said fans and serving to separate said columns of air as they pass through the fans.

3. In a heat exchanger, a ring shaped radiator,

' an outer fan positioned substantially parallel to the face of said radiator, to pass an annular column of air through said radiator, a cylindrical ring on which the blades of said outer fan are mounted, and an inner fan to the tips of which saidring is secured, said fan being positioned toportion of said bracket, and a fan carried by said motor.

5. In a heat exchanger, a bracket, a pair of headers rigidly secured to the respective ends of said bracket andforming continuations thereof in substantial alignment therewith, so as to form therewith a diainetrical mounting, a plurality of concentric semi-circular radiator tubes the respective ends of which are connected to the respective headers, said tubes being disposed on opposite sides of the mounting to form a ring shaped radiator, a motor mounted on an intermediate portion of said bracket, and a fan carried by said motor.

6. In a space heater, a pair of headers, a motor bracket rigidly connecting said headers, a plurality of arched radiator tubes the respective ends of which are connected to the respective headers, said tubes being disposed inopposed positions on both sides of said headers so as to form a ring shaped radiator assembly, and having sufiicient flexibility to conform to expansional and contractional strains caused by temperature changes without loosening their connections with the headers, a motor suspended from an upper portion of said bracket and a fan carried by said motor and arranged to direct a stream of air axially through said radiator assembly.

7. In a space heater, a pair of headers, a C

shaped motor bracket secured to the opposed end faces of said headers, a motor mounted on said bracket, between the arms of said bracket, a fan on the motor, and a radiator the respective ends of which are connected to the respective headers and the intermediate region of which is arched.

8. In a space heater, a pair of headers, a O shaped motor bracket secured to the opposed end faces of said headers, a motor suspended from the upper arm of said'bracket, between the arms of said bracket, a Ian on the motor, and a radiator the respective ends of which are connected to the respective headers and the intermediate region of which is arched.

9. In a heat exchanger, a pair of open sided headers, a radiator comprising vaned tubes, gasket plates of sheet metal having punched openings bordered by punched out rims, said rims receiving and welded to the ends of said tubes, cap plates through which the adjacent end portions of said tubes extend, and means securing said cap plates to the headers with the gasket plates clamped between the cap plates and the headers, and closing said open sides, said gasket plates being sufliciently pliable to conform to the surfaces of the cap plates and headers and to form a fluid-tight seal between the headers and the tubes.

10. In a heat exchanger, a ring shaped radiator, an outer fan positioned substantially parallel to the face of said radiator its path of travel substantially coinciding therewith so as to pass an annular column oi air through said radiator, and an inner ian positioned to propel a column of unconditioned air within said annular column of air.

11. In a heat exchanger, a ring shaped radiator, an outer fan positioned substantially parallel to the face of said radiator its path of travel substantially coinciding therewithso as to pass an annular column of air through said radiator, an inner fan positioned to propel a column of unconditioned air within said annular column of air,

and a sleeve separating the space occupied by said radiator and the space in the center of the radiator so as to segregate said annular column 01 air from said column of unconditioned air as the two pass through the heat exchanger.

12. In a heat exchanger, a ring shaped radiator, an outer ian positioned substantially parallel to the face of said radiator its path of travel substantially coinciding therewith so as to pass an annular column 01' air through said radiator, an inner tan positioned to propel a column of unconditioned air within said annular column of air, a sleeve separating the space occupied by said radiator and the space in the center of the radiator so as to segregate said annular column 01' air from said column of unconditioned air as the two pass through the heater, and a cylindrical hood surrounding the periphery of said radiator. i

13. In a heat exchanger, a ring shaped radiator, an outer fan positioned substantially parallel to thetace of said radiator, so as to pass an 3 annular column of air th'erethrough, an inner i'an positioned to propel a column 01' unconditioned air within said annular column, and means to eilect separation oi. said columns.

14. In a heat exchanger, a ring shaped radi-' ator, and a pair of coaxial fans positions. substantially parallel to the face of said radiator, one 01 said fans being an outer, annular fan positioned to move an annular column of air through said radiator, and the other being an inner fan positioned to propel a column of unconditioned air within said annular column.

15. In a heat exchanger, a ring shaped radiator, and a pair of coaxial fans positioned substantially parallel to the face of said radiator, one of said fans being an outer, annular fan positioned to move an annular column of air through said radiator, and the other being an inner fan positioned to propel a column of unconditioned air within said annular column, said outer fan being joined to and surrounding the periphery of said inner fan.

16. In a heat exchanger, a ring shaped radiator, an annular hood projecting generally in an axial direction from the periphery of said radiator, an outer fan positioned substantially parallel to the face 01' said radiator, its path of travel substantially coinciding therewith, and in the space encircled by said hood, so as to pass an annular column 01' air therethrough, and an inner tan positioned to propel a column of unconditioned air within said annular colunm.

LACI-ILAN W. CHILD. 

